diff --git a/app/Http/Controllers/Backstage/ConcertsController.php b/app/Http/Controllers/Backstage/ConcertsController.php
index 5cc046b..aef02a1 100644
--- a/app/Http/Controllers/Backstage/ConcertsController.php
+++ b/app/Http/Controllers/Backstage/ConcertsController.php
@@ -38,7 +38,7 @@ class ConcertsController extends Controller
             'zip' => ['required'],
             'ticket_price' => ['required', 'numeric', 'min:5'],
             'ticket_quantity' => ['required', 'numeric', 'min:1'],
-            'poster_image' => ['nullable', 'image', Rule::dimensions()->minWidth(400)->ratio(8.5/11)],
+            'poster_image' => ['nullable', 'image', Rule::dimensions()->minWidth(600)->ratio(8.5/11)],
         ]);
 
         $concert = Auth::user()->concerts()->create([
diff --git a/tests/Feature/Backstage/AddConcertTest.php b/tests/Feature/Backstage/AddConcertTest.php
index dad8780..fc60a6d 100644
--- a/tests/Feature/Backstage/AddConcertTest.php
+++ b/tests/Feature/Backstage/AddConcertTest.php
@@ -410,11 +410,11 @@ class AddConcertTest extends TestCase
     }
 
     /** @test */
-    function poster_image_must_be_at_least_400px_wide()
+    function poster_image_must_be_at_least_600px_wide()
     {
         Storage::fake('public');
         $user = factory(User::class)->create();
-        $file = File::image('poster.png', 399, 516);
+        $file = File::image('poster.png', 599, 775);
 
         $response = $this->actingAs($user)->from('/backstage/concerts/new')->post('/backstage/concerts', $this->validParams([
             'poster_image' => $file,